Stair construction



Feb. 27, 1923. 1,446,454,.

- A. F S C H E R.

STAIR CONSTRUCTION.

FILED JUNE 26,1922. 2 SHEETS-SHEET 1.

Feb. 27, 1923. 1,446,454.

A. FISCHER. STAIR CONSTRUCTION.

FILED JUNE 26, 1922 2 SHEETS-SHEET 2..

Patented Feb. 27, 1923.

ADAM rrscnnn; orcnicaeo,ILLrnoIsAssmnoa '10 eUAsAnrY. men & s'rE-EL 00., or cmcaeaitmuors, a oosronarron or ILLINOIS.

STAIR CONSTRUCTION.

Application filed June 26, 1922.

'1 0 all whom it may concern.

Be it known that I, ADAM FIsoHnn, a citizen'ot the United States of America, and a resident of Chicago, county of Cook and State of Illinois, have invented a new and useful Improvement in sem- Constructions, of which the following is a specification.

The main objects of this invention are to provide an improved stair construction wherein he steps comprise metal forms assembl' cl on a supporting structure and have wear-resisting treads made from a plastic substance poured into a step form and allowed to harden; to provide airimproved stair construction of this kind which permits the use of sheet metal 'stampings-ior the step forms; to provide an improved construction and arrangement ofsaid sheet metal stampings;'t-o provide an improved construction and arrangement of a con/mien central support and an improved construction of the step forms whereby said step forms may be assembledon sai d' support in a'spiral relation for forming a spiral stairway; to provide improved means for rigidly securing the steps to said centralsupport; to provide an improved stair construction of this kind whichcanbemanufactured in'sections and shipped in"knockdown form, the sections being so designed and shaped that the assembling thereof-to form a stair is simple and easy; and to provides'uch a stair construction wherein the replacement of worn or injured steps is convenient and economical.

An illustrative embodiment of this invention is shown in the accompanying d awingsyin which Figure 1 is a plan. of a spirat-stairway constructed in accordance with this invention.

Fig. 2 is a side elevation of a portion-oi the sa ine.

Fig. 8 is anenlarged plan of an improved triangular shapedste'p adapted for use in the formation'o'f a spiral stairway.

Fig.4 is a front elevation of one step, and a sectional elevation-0t another ofthe type shown in Fig. 3.

Fig. 5 is 'asectional detail taken'on'the line 5-5 of Fig.3.

Fig.6 is fragmentary gdet'ail viewof the arrangement show'nin Fig. ehthe viewbeing taken on the: plane of the line h ti-of 'said figure.

Serial No. 571,008.

a. stair constructed in accordance with thls invention involves the use of a pair of metal stampmgs shaped so that when assembled to form a step section they provide a horizontally disposed mold into which form a tread and provide a riser in the form of a transverselydisposed reinforcing web, each pair of the stampings having a rod secured thereto by which the step seetion is secured to a suitable support. i

In the specific embodiment herein shown the step sections are constructed soas to be used in the formation of a spiral stairway.

Eachstep section comprises a pair of metal stamplngs 1 and 2, and is secured to a commo n central support '3' by means of a rode, and each step section is the more" rigidly held in place by brackets 5 and rail supports 6.

The metal stampings 1 and 2 mightb'e variously shaped, but inthe particular form herein illustrated they are substantially in angular shape. The stamping 1 has flanges 7 and 8 termed along the edges thereof .60 concrete is adapted to be poured in order to I and extending in oppositedirections. The

stamping 2 has a transversely disposed flange 9 formed along one edge thereof and intermediate itsends' isofi'set obliquely as at 10 so as to provide a laterally disposed flange 11 above the oblique offset 10, the" which concrete or' other suitable cemen titious substance to be poured sons to furnlsh a wear resrstingtread 13. The ends oi the mold are closed by the sufniort 3 amid a plate let, the latter of which securedto the ends of the stampings by means of the angle bar M (seeFigJiY. The stamping 2 below the oblique offset 10 constitutes the riser for the step and also serves as a reinforcing web "for the same.

The supportfl as herein shown is in' the form. of a pipe, the ends otwhich are secured by suitable plates or brackets (not shown) to the" floor construction which". the stair connects. ea suitably sparetil. intervals,

lit)

is such that its inner end protrudes beyond 4 the step a suflicient distance to extend through the pipe 3, and its outer end beyond the plate 14. Nuts 17 and 18 are secured on the respective ends of the rod, which are adapted to be drawn up so as to firmly clamp the step tothe pipe 3. The rod being buried in the concrete tread 13, further rigidly cures the rod and step together.

. lVhen assembled on the post or support 3 the steps are further braced and secured in their relative positions by the plates or brackets 5 and the rail supporting posts 6. Each of the platesh is in the form of a strip of metal, the lower end ofwhich is secured to the inner end of a flange 7 of one step by means of a suitable bolt and nut 19, and at intervals along the length of the brace above said step secured by rivets 20., or other means to the stampingfl adjacent to the base thereof. The post support 6 is in the form of abar of rectangular cross-section secured'at its lower end to the plate 14 of one step, and to the forward projecting part of the plate 14. and the step above, as is most, clearly indicated in Fig. 6. These posts 6 are of such adength that the upper ends thereof are disposed so that a pipe or rod 21 is rigidly secured to the tops thereof and provides a hand rail for one ascending or descending the stairway.

The advantage of afstair construction of this kind is that the step forms or sections can be made up of sheet metal stampings, and the other parts suitably cut and shaped so that the stair can beshipped in knockdown form, and after arrival at its destination may be quickly and easily set up. Being stampings the step parts are lessexpensive to manufacture than castings and are in. many respects stronger and more durable. After-the step forms have liadthe concrete poured therein and allowed to harden, a very substantial and rigid stair construct-ion is provided. In the eventthat one the steps becomesv injuredorfor some other reason needs replacing it can be quickly and con veniently accomplished. I

Although but one'specific embodiment of this invention has been herein shownand described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of'this invention as defined.

by'the following claims.

. I claim:

1. A stair construction comprising a step section made up of two metalstainpings secured together to provide a horizontal part and a transverse reinforcing web, and upstanding perimetral flanges formed along one radial edge and the end of said horizontal part, said horizontal partbeing secured along its other radial edge to said transverse web below the top edge thereof whereby a. portion of said web coacts with said perimetral flanges to, form a mold for a cementitious tread.

2. A stair construction comprising a step section made up of two metal stampings each of substantially triangular form secured together with the edge of one stamp ing located intermediate the edges of the other so as to provide a horizontal part and a transverse reinforcing web, the base of the other stainping being located adjacent the apex of said one stamping, perimetral flanges on said horizontal part coacting with the upper portion of said transverse part to provide a mold for a concrete tread.

3. A stair construction comprising a step section made up of two metal stampings of substantially triangular form, one ofv said stampings having flanges formed along the edges thereof, the other stamping.having a longitudinal offset intermediate its edges whereby the portions thereof are disposed in spaced substantially parallel planes, said stampings being secured together withthe radial edge of said one stamping extending longitudinally of the other adjacent to said ofi'set, and'with the flange alongthe outer radial edge extending upwardlyand coacting with the upper portion of said-other stamping to provide a mold for concrete.

4. A stair construction comprisinga step section made up of two metal stampings of substantially triangular form, one of said stampingshaving flanges formed along the edges thereof, the other stamping having a longitudinal offset, intermediate its edges whereby the portions thereof are disposed in spaced substantially parallel planes, said other stamping having an inwardly disposed transverse I flange formed along the upper radial edge thereof, said stampings' being secured together with the radial edge of said onestamping extending longitudinally of the other adjacent to said offset, and with the flange along the.

outer radial edge extending upwardly and a rod rigidly secured to said transverse reinforcing Web above said horizontal part, said rod having the end thereof projecting beyond said stainpings to permit said step section to be secured to a support.

6. A stair construction comprising a step section made up of tWo metal stampings of substantially triangular form, one of said stampings having flange-s formed along the edges thereof, the other stamping having a longitudinal offset intermediate its edges whereby the portions thereof are disposed in spaced substantially parallel planes, said stampings being secured together with the radial edge of said one stamping extending longitudinally of the other adjacent to said offset, and With the flange along the outer radial edge extending upwardly and coacting with the upper portion of said other stamping to provide a mold for concrete, and a rod rigidly secured to the inside face of the upper offset portion of said other stamping, said rod having the end thereof project beyond said s-tanipings so as to permit said step section to be secured to a support.

Signed at 1922.

Chicago this 24th day of June,

ADAM FISCHER. 

